I use crypto to do international transfers to Argentina. It's cheaper. I also get a way better rate that way. I try to do it as fast as possible due to the quickly changing rate you mentioned.
On the other side, if I use crypto, the value of my bitcoins (well, my fraction of a bitcoin) is decided not by the government but by the market. That alone makes a difference of between 33% and 60% of the transfer amount.
For example, right now officially an euro is 115 ARS. But non-officially is 184 ARS.